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rhinosnow

v1.0.0

Published

Detect browser extensions like ad blockers and Dark Reader

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Maintainers

grmlgrml

Keywords

Readme

rhinoSnow

Lightweight, SSR-safe browser extension detection for JavaScript and TypeScript. Detect ad blockers and Dark Reader with zero dependencies.

Install

npm install rhinosnow

Usage

import {
  detectAdBlocker,
  detectDarkReader,
  checkAndWarnDarkReader
} from "rhinosnow";

// Detect ad blockers
if (detectAdBlocker()) {
  console.log("Ad blocker detected");
}

// Detect Dark Reader
if (detectDarkReader()) {
  console.log("Dark Reader detected");
}

// Show a dismissible warning banner if Dark Reader is active
checkAndWarnDarkReader();

// Or with a custom message
checkAndWarnDarkReader("Please disable Dark Reader for the best experience.");

API

detectAdBlocker(): boolean

Creates a hidden bait element with common ad-related class names and checks whether it was hidden or removed by an ad blocker.

Returns true if an ad blocker is detected, false otherwise.

detectDarkReader(): boolean

Checks for the presence of Dark Reader by looking for:

  • Injected <style> elements with Dark Reader classes
  • data-darkreader-* attributes on <html>
  • Dark Reader <meta> tags
  • CSS invert + hue-rotate filters on <body>

Returns true if Dark Reader is detected, false otherwise.

checkAndWarnDarkReader(warningMessage?: string): boolean

If Dark Reader is detected, displays a fixed-position warning banner in the top-right corner of the page. The banner auto-dismisses after 10 seconds or can be clicked to dismiss immediately. Repeated calls will not create duplicate banners.

| Parameter | Type | Default | |---|---|---| | warningMessage | string (optional) | "Dark Reader extension detected. Please disable it on this site to prevent potential crashes due to performance issues." |

Returns true if the warning is shown (or already visible), false otherwise.

SSR Safety

All functions are safe to import and call in server-side environments (Next.js, Nuxt, SvelteKit, etc.). They return false when window or document is not available.

Browser Support

Works in all modern browsers that support getComputedStyle and querySelector.

License

MIT